test the current behavior of duplicate keys set to object, then primitive, then object

src/test/scala/com/typesafe/config/impl/ConfParserTest.scala

@@ -188,6 +188,23 @@ class ConfParserTest extends TestUtils {
         assertEquals(100, obj.getInt("a.b.c.z"))
     }
 
+    @Test
+    def duplicateKeyObjectNullObject() {
+        // null is supposed to "reset" the object at key "a"
+        val obj = parseObject("""{ a : { b : 1 }, a : null, a : { c : 2 } }""")
+        assertEquals(1, obj.size())
+        assertEquals(1, obj.getObject("a").size())
+        assertEquals(2, obj.getInt("a.c"))
+    }
+
+    @Test
+    def duplicateKeyObjectNumberObject() {
+        val obj = parseObject("""{ a : { b : 1 }, a : 42, a : { c : 2 } }""")
+        assertEquals(1, obj.size())
+        assertEquals(1, obj.getObject("a").size())
+        assertEquals(2, obj.getInt("a.c"))
+    }
+
     @Test
     def impliedCommaHandling() {
         val valids = Seq(